Question

Один трактор может вспахать поле за 14 ч, а другой - за 8 ч. Какой трактор больше вспашет: первый за 7 часов или второй за 5 часов

Answer 1

1-все поле, 1/14-поля вспахивает первый трактор за 1 час, 1/8 - поля вспахивает второй трактор за 1 час
7*1/14=7/14=1/2=4/8
5*1/8=5/8, 5/8>4/8, второй сделает больше

Answer 2

Question Analysis

The question asks which tractor will plow more land: the first tractor in 7 hours or the second tractor in 5 hours. To answer this question, we need to compare the plowing rates of the two tractors.

Answer

To determine which tractor will plow more land, we need to compare the plowing rates of the two tractors. The first tractor can plow a field in 14 hours, while the second tractor can plow the same field in 8 hours

To calculate the plowing rate, we can use the formula: rate = amount of work / time. In this case, the amount of work is the size of the field, and the time is the number of hours it takes to plow the field.

Let's calculate the plowing rates for both tractors:

- First tractor: rate = 1 field / 14 hours = 1/14 field per hour - Second tractor: rate = 1 field / 8 hours = 1/8 field per hour

Now, let's compare the plowing rates for the two scenarios:

1. First tractor in 7 hours: - Plowing rate: 1/14 field per hour - Total work done: (1/14 field per hour) * 7 hours = 1/2 field

2. Second tractor in 5 hours: - Plowing rate: 1/8 field per hour - Total work done: (1/8 field per hour) * 5 hours = 5/8 field

Comparing the two scenarios, we can see that the second tractor, plowing for 5 hours, will plow more land (5/8 field) compared to the first tractor plowing for 7 hours (1/2 field).

Therefore, the second tractor will plow more land.

Conclusion

The second tractor, plowing for 5 hours, will plow more land compared to the first tractor plowing for 7 hours. The plowing rates of the two tractors were calculated based on the information provided, and it was determined that the second tractor has a higher plowing rate.